摘要
以多孔管式陶瓷膜为基膜,以高岭土、二氧化锆为涂膜材料,采用错流操作方式在膜管内表面制备单层和双层复合动态膜,对比分析单层和双层动态膜对水包油型油水乳化液的分离效果,考察双层动态膜制备和分离条件对分离性能的影响规律.结果表明,高岭土-Zr O2双层复合动态膜具有内层疏松、外层紧密的结构,其油截留率和乳化液COD去除率分别达到99.7%和99.5%,分离性能优于单层动态膜;随着Zr O2动态膜层涂膜时间和跨膜压差的增大,渗透通量均出现先增大后减小的趋势;随着油水乳化液p H值和油水乳化液质量浓度的减小,膜的渗透通量增大.
Hydrophilic single and double layer dynamic membranes （DMs） were prepared and applied to cross-flow microfiltration of oil-in-water emulsion. Tubular porous ceramic membrane was used as the substrate. Kaolin and zir-conium dioxide （ZrO2） particles were selected as coating materials. The separation effects of the single and double layer dynamic membrane on oil-in-water emulsion were analyzed. The influence law of the preparation and separation conditions of double layer dynamic membrane on separation performance were investigated.Experimental results show that the prepared double layer DM has a looser internal layer and a denser external layer. Oil rejection rate and COD removal rate can reach 99.7% and 99.5% respectively, which aresuperior to those with single layer DMs. The smaller the pH of oil-in-water emulsion is, the higher the permeation flux is. With increases in the ZrO2 coating time and the trans-membrane pressure difference, the permeation flux first increases, and then decreases. The lower the oil-in-water emulsion mass concentration is, the greater the permeation flux is.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2015年第3期269-274,共6页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(20976020)
关键词
动态膜
陶瓷膜
双层
油水乳化液分离
错流微滤
dynamic membrane
ceramic tube
double layer
oil-in-water emulsion separation
cross-flow micro-filtration
